[issue32553] venv says to use python3 which does not exist in 3.6.4

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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components: +Windows
nosy: +paul.moore, steve.dower, tim.golden, zach.ware

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32553>
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